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Treatment Instruments
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Number: 14
Comparative Investigation with the aid of a Scanning Electron Microscope into Root Canal Instrumentation carried out manually or mechanically
E. Schäfer, K. Zapke
Outpatients Clinic for Tooth Preservation, Münster
01.04.2010
The 'cleaning effect' of two mechanically-operated root canal Instrumentation Systems and of three manually-o per ated Instrumentation techniques, äs well äs their shaping characteristics in the course of the Instrumentation carried out were investigated with the aid of a scanning electron microscope. 12 teeth each with either st r a ig ht or curved root canals were instrumented in each case up to ISO - size 40 with manually-operated reaming-motion K-Flexofiles, according to the Step-back Technique also with K-Flexofiles, manually filing with Hedström files, mechanically with the KaVo-Endo-System featuring torque-limited rotation and using K-Flexofiles, äs well äs with the mechanical Profile System using nickel-titanium Instruments.
© 2010 Outpatients Clinic for Tooth Preservation
Comparative Investigation with the aid of a Scanning Electron Microscope into Root Canal Instrumentation carried out manually or mechanically
E. Schäfer, K. Zapke
Outpatients Clinic for Tooth Preservation, Münster
01.04.2010
The 'cleaning effect' of two mechanically-operated root canal Instrumentation Systems and of three manually-o per ated Instrumentation techniques, äs well äs their shaping characteristics in the course of the Instrumentation carried out were investigated with the aid of a scanning electron microscope. 12 teeth each with either st r a ig ht or curved root canals were instrumented in each case up to ISO - size 40 with manually-operated reaming-motion K-Flexofiles, according to the Step-back Technique also with K-Flexofiles, manually filing with Hedström files, mechanically with the KaVo-Endo-System featuring torque-limited rotation and using K-Flexofiles, äs well äs with the mechanical Profile System using nickel-titanium Instruments.
© 2010 Outpatients Clinic for Tooth Preservation
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Noise level measurements of the air noise during drilling and grinding on the fresh isolated temporal bone
Paulsen K, Vietor K
Laryngol Rhinol Otol (Stuttg). , 29.03.2010
Aerial sound measurements with different drilling instruments were performed during dry running and preparations of the bone. Registered were the values of the small drilling instruments Sirona, Dentatus-Air, and Electro-Torque-Ritter. Also tested were the KaVo-Technique-machine, the Hall-machine, the Air-Orbit-turbine, and the Sirona-turbine.
© PMID: 129600 [PubMed - indexed for MEDLINE]
Noise level measurements of the air noise during drilling and grinding on the fresh isolated temporal bone
Paulsen K, Vietor K
Laryngol Rhinol Otol (Stuttg). , 29.03.2010
Aerial sound measurements with different drilling instruments were performed during dry running and preparations of the bone. Registered were the values of the small drilling instruments Sirona, Dentatus-Air, and Electro-Torque-Ritter. Also tested were the KaVo-Technique-machine, the Hall-machine, the Air-Orbit-turbine, and the Sirona-turbine. During dry running most of them already reached the allowed marginal value of noise nuisance for the ear of 85 dB (A) at a distance of 35 cm. Only the Air-Orbit-machine showed a slightly lower value of 80 dB (A). The level increases with the used handpieces. Normal handpieces 1:1 exert only a minimal influence, gear handpieces 2:1, however, markedly increase the level. The verticity is of no importance in the range of normal rotations between 10,000 r/min. and 80,000 r/min. Only rotations in the lower frequency range of 2,000 r/min. markedly decrease the noise level. During bone drilling, the kind and size of the drilling bit have an influence on the intensity of the noise level. Quadruple wing milling cutters create a very high noise level (at a distance of 15 cm still above 110 dB [A!]), big rose cutters (R 16) create noise levels of 95 dB (A) and above, and only diamond round bits create less noise (approximately 88 db [A]). Small drilling bits make such a faint noise, that it is overroared by the drilling instrument. The turbines create only slightly higher levels than during dry running. Larger drilling bits cannot be employed here on principle. Wing milling cutters can lead to persistent damages of the inner ear. The frequent use of dental drilling instruments for bone preparations can also lead to a hearing loss of the operator in the long run.
© PMID: 129600 [PubMed - indexed for MEDLINE]
Noise level in dental laboratory practice
Sun J, Yao JJ, Tan Y, Zhang FQ
Shanghai Kou Qiang Yi Xue, 01.12.2009
Dental technicians are exposed to different noises. The aim of this study was to determine the noise level produced by different dental laboratory handpieces and special equipments in one dental lab.
© PMID: 20143015 [PubMed - in process]
Noise level in dental laboratory practice
Sun J, Yao JJ, Tan Y, Zhang FQ
Shanghai Kou Qiang Yi Xue, 01.12.2009
PURPOSE: Dental technicians are exposed to different noises. The aim of this study was to determine the noise level produced by different dental laboratory handpieces and special equipments in one dental lab. METHODS: The noise level produced by two dental laboratory handpieces(Kavo K9, NSK Vmax) was measured at distance of 15cm, 30cm and 45cm in free-running and different working conditions. Additionally, the noise level produced by some dental laboratory equipments and procedures were also measured both near the technician's ear and 1.5 meters away. The noise level was determined using a precious sound level meter. RESULTS: The mean value of noise level of the two dental laboratory handpieces measured at all distances and in all conditions was between 61 to 83 dB. The noise level produced by some dental laboratory equipments were much higher, with high-speed metal cutting, steam cleaning and power pillo trimmer exceeding 90dB. Noise level inside the denture fabrication room was between 65 to 83 dB. CONCLUSIONS: The noise level in the dental laboratory is considered to be a potential risk causing hearing loss. Regular audiometry checking up should be carried out among the dental technicians and ear protectors must be used during work. Supported by Shanghai Leading Academic Discipline Project (Grant No.T0202) and Research Fund of Science and Technology Commission of Shanghai Municipality(Grant No.08D22271100).
© PMID: 20143015 [PubMed - in process]
Comparison of torque measurements and clinical handling of various surgical motors
Neugebauer J, Scheer M, Mischkowski RA, An SH, Karapetian VE, Toutenburg H, Zoeller JE.
Interdisciplinary Department of Oral Surgery and Implantology, University of Cologne, Köln, Germany
Int J Oral Maxillofac Implants;(3):469-76, 01.06.2009
Modern implant dentistry requires the application of torque during various treatment steps. This study investigated seven different surgical motors for the accuracy of the applied torque and their reliability.
© Quintessenz Verlag; PMID: 19587869 [PubMed - indexed for MEDLINE]
Comparison of torque measurements and clinical handling of various surgical motors
Neugebauer J, Scheer M, Mischkowski RA, An SH, Karapetian VE, Toutenburg H, Zoeller JE.
Interdisciplinary Department of Oral Surgery and Implantology, University of Cologne, Köln, Germany
Int J Oral Maxillofac Implants;(3):469-76, 01.06.2009
PURPOSE: Modern implant dentistry requires the application of torque during various treatment steps. This study investigated seven different surgical motors for the accuracy of the applied torque and their reliability. MATERIALS AND METHODS: The following surgical motors were evaluated: Chiropro 980 (Bienair), INTRAsurg 300 and INTRAsurg 500 (KaVo), Osseocare (Nobel Biocare), Surgic XT (NSK), Elcomed SA-200 C (W and H), and Osseo System (XO Dentalcare). The torque was measured during typical surgical and prosthetic procedures using a special load transfer mechanism for a torque gauge. For each setting, 30 measurements were made and means were calculated. RESULTS: The highest percentage shortfall was 20.5% at a set torque of 11.4 Ncm (absolute deviation of -2.4 Ncm). The highest percentage by which a torque was exceeded was 54.6% (absolute deviation of 5.5 Ncm). The lowest value for absolute shortfall was found to be -5.6 Ncm at a set torque of 45 Ncm. The highest absolute exceeded was 15 Ncm at a set torque of 40 Ncm. Potentially problematic torque values were identified in the low-torque-value setting, as the implant position may be changed if a machine driver applies excessive torque to the first-stage healing screw. In addition, in the indication of immediate loading in the high-set-torque group, torque values above the critical value of 50 Ncm may be unwittingly applied while working with a set torque of 40 Ncm. CONCLUSION: For most of the clinically relevant torque settings, precise values were
© Quintessenz Verlag; PMID: 19587869 [PubMed - indexed for MEDLINE]
Retrievability of implant-retained crowns following cementation
Mehl C, Harder S, Wolfart M, Kern M, Wolfart S
Department of Prosthodontics, Propaedeutics and Dental Materials, Christian-Albrechts University at Kiel, Keil, Germany
Clin Oral Implants Res. 2008 Dec;19(12):1304-11, 01.12.2008
The purpose of this study was to assess the retrievability of cemented implant crowns using two different removal devices.
© PMID: 19040447 [PubMed - indexed for MEDLINE]
Retrievability of implant-retained crowns following cementation
Mehl C, Harder S, Wolfart M, Kern M, Wolfart S
Department of Prosthodontics, Propaedeutics and Dental Materials, Christian-Albrechts University at Kiel, Keil, Germany
Clin Oral Implants Res. 2008 Dec;19(12):1304-11, 01.12.2008
OBJECTIVES: The purpose of this study was to assess the retrievability of cemented implant crowns using two different removal devices. The influence of five cement types and two cement application techniques was evaluated. METHODS: Forty copings were cast from a CoCr alloy for 40 tapered titanium abutments (5 degrees taper, 4.3 mm diameter, 6 mm height, Camlog, Germany). Twenty copings were modeled as single crowns, whereas 20 copings were modeled with an extension to simulate fixed partial dentures (FPDs). Before cementation, the inner surfaces of the copings were air-abraded (50 mum Al(2)O(3) particles at 2.5 bars), while the abutments were used as delivered with machined surfaces. Copings were cemented with eugenol-free zinc oxide (Freegenol), zinc phosphate (Harvard), glass ionomer (Ketac Cem), polycarboxylate (Durelon) and so-called self-adhesive resin (RelyX Unicem) cement. Cement was applied in a thin film band of 1 or 3 mm to the cervical margin of the inner surface of the copings, respectively. After cementation, specimens were stored in saline solution for 24 h. The Coronaflex and a standardized custom-made removal device were used to remove the copings from the abutments. RESULTS: Using the same cement, no statistically significant influence with regard to the type of restoration (crown/FDP), cement application mode and device was detected (P>0.05). Therefore, data of specimens cemented with the same cement were pooled. Median attempts to remove the copings were: zinc oxide: 3, self-adhesive resin: 3, zinc phosphate: 5, glass ionomer: 16 and polycarboxylate: 58. Four levels of significance (P<0.0001) were found: (1) zinc oxide/self-adhesive resin; (2) zinc phosphate; (3) glass ionomer; and (4) polycarboxylate. CONCLUSIONS: Zinc phosphate and glass ionomer cement might be suitable for a so-called 'semipermanent' (=retrievable) cementation, while polycarboxylate seems to provide the most durable cementation.
© PMID: 19040447 [PubMed - indexed for MEDLINE]
Post space debridement in oval-shaped canals: the use of a new ultrasonic tip with oval section
Coniglio I, Carvalho CA, Magni E, Cantoro A, Ferrari M
Department of Fixed Prosthodontics and Dental Materials, University of Siena, Siena, Italy
J Endod;(6):752,5, 01.06.2008
This study evaluates the effect on post space debridement in oval-shaped canals of an experimental ultrasonic tip with oval section (Satelec) compared with a circular ultrasonic tip (KaVo).
© Elsevier Verlag; PMID: 18498906 [PubMed - indexed for MEDLINE]
Post space debridement in oval-shaped canals: the use of a new ultrasonic tip with oval section
Coniglio I, Carvalho CA, Magni E, Cantoro A, Ferrari M
Department of Fixed Prosthodontics and Dental Materials, University of Siena, Siena, Italy
J Endod;(6):752,5, 01.06.2008
This study evaluates the effect on post space debridement in oval-shaped canals of an experimental ultrasonic tip with oval section (Satelec) compared with a circular ultrasonic tip (KaVo). Thirty teeth with an oval-shaped canal were endodontically treated and obturated and then randomly divided into 3 groups (n = 10) according to the procedure used for post space debridement: Satelec tip, Largo #2 drill + KaVo file, and Largo #2 drill + water. Debris and dentin tubules were evaluated by assigning scores to scanning electron microscope post spaces images; lower scores corresponded to fewer debris and higher number of open tubules. The Satelec group showed significantly lower debris and open tubules scores than KaVo group (p < .05) and control group (p < .05), which differed significantly between each other (p < .05). Also the debris and open tubules scores in different post space regions differed significantly among the experimental groups (p < .001). The oval ultrasonic tip resulted in a better post space debridement than a circular ultrasonic tip in oval-shaped canals.
© Elsevier Verlag; PMID: 18498906 [PubMed - indexed for MEDLINE]
Influence of beveling and ultrasound application on marginal adaptation of box-only Class II (slot) resin composite restorations
Schmidlin PR, Wolleb K, Imfeld T, Gygax M, Lussi A
Department of Preventive Dentistry, Periodontology and Cariology, Center for Dental Medicine, University of Züirich, Zürich, Switzerland
Oper Dent. , 01.06.2007
A laboratory study was performed to assess the influence of beveling the margins of cavities and the effects on marginal adaptation of the application of ultrasound during setting and initial light curing. After minimal access cavities had been prepared with an 80 microm diamond bur, 80 box-only Class II cavities were prepared mesially and distally in 40 extracted human molars using four different oscillating diamond coated instruments: (A) a U-shaped PCS insert as the non-beveled control (EMS), (B) Bevelshape (Intensiv), (C) SonicSys (KaVo) and (D) SuperPrep (KaVo).
© PMID: 17555182 [PubMed - indexed for MEDLINE]
Influence of beveling and ultrasound application on marginal adaptation of box-only Class II (slot) resin composite restorations
Schmidlin PR, Wolleb K, Imfeld T, Gygax M, Lussi A
Department of Preventive Dentistry, Periodontology and Cariology, Center for Dental Medicine, University of Züirich, Zürich, Switzerland
Oper Dent. , 01.06.2007
A laboratory study was performed to assess the influence of beveling the margins of cavities and the effects on marginal adaptation of the application of ultrasound during setting and initial light curing. After minimal access cavities had been prepared with an 80 microm diamond bur, 80 box-only Class II cavities were prepared mesially and distally in 40 extracted human molars using four different oscillating diamond coated instruments: (A) a U-shaped PCS insert as the non-beveled control (EMS), (B) Bevelshape (Intensiv), (C) SonicSys (KaVo) and (D) SuperPrep (KaVo). In groups B-D, the time taken for additional bevel finishing was measured. The cavities were filled with a hybrid composite material in three increments. Ultrasound was also applied to one cavity per tooth before and during initial light curing (10 seconds). The specimens were subjected to thermomechanical stress in a computer-controlled masticator device. Marginal quality was assessed by scanning electron microscopy and the results were compared statistically. The additional time required for finishing was B > D > C (p < or = 0.05). In all groups, thermomechanical loading resulted in a decrease in marginal quality. Beveling resulted in higher values for "continuous" margins compared with that of the unbeveled controls. The latter showed better marginal quality at the axial walls when ultrasound was used. Beveling seems essential for good marginal adaptation but requires more preparation time. The use of ultrasonic vibrations may improve the marginal quality of unbeveled fillings and warrants further investigation.
© PMID: 17555182 [PubMed - indexed for MEDLINE]
The influence of 2 condensation techniques on the marginal seal of packable resin composite restorations
Ben-Amar A, Slutzky H, Matalon S
Department of Oral Rehabilitation, The Maurice and gabriel Goldschleger School of Dental Medicine, Tel-Aviv University, Israel
Quinteccence;(5):423-8, 01.05.2007
To evaluate the effect of manual condensation versus a combination of manual and mechanical, or automatic, condensation on the gingival marginal seal of packable resin composite restorations.
© Quintessenz Verlag; PMID: 17568842 [PubMed - indexed for MEDLINE]
The influence of 2 condensation techniques on the marginal seal of packable resin composite restorations
Ben-Amar A, Slutzky H, Matalon S
Department of Oral Rehabilitation, The Maurice and gabriel Goldschleger School of Dental Medicine, Tel-Aviv University, Israel
Quinteccence;(5):423-8, 01.05.2007
OBJECTIVE: To evaluate the effect of manual condensation versus a combination of manual and mechanical, or automatic, condensation on the gingival marginal seal of packable resin composite restorations. METHOD AND MATERIALS: Two packable composites, Pyramid Dentin (Bisco Dental) and Filtek P-60 (3M Espe), were tested. The study consisted of 37 extracted caries-free human molars and premolars. In each tooth, 2 standardized Class 2 cavities were prepared and restored using the incremental technique; the mesial restoration was condensed by hand instrument, and the distal by a combination of the manual and mechanical condenser (KaVo). Restored teeth were subjected to automatic thermal stresses and cycling load stresses. Teeth were immersed in 0.5% basic fuchsin at 37 degrees C for 96 hours. Samples were sectioned mesiodistally in 3 sections. Dye penetration at the gingival margin was examined. RESULTS: Automatic condensation of Filtek P-60 and Pyramid demonstrated better sealing properties, with a median dye penetration of 0 and 1, respectively (on a dye penetration scale of 0 to 3), compared to manual condensation, median of 2 (P = .043) and 3 (P = .079), respectively. Better sealing ability was shown with P-60 than with Pyramid Dentin when manual condensation was used (P = .037). No significant difference was observed between the 2 products when tested with automatic condensation (P = .066). CONCLUSION: In this in vitro study the combination of manual and automatic condensation resulted in reduced gingival margin microleakage for both packable composites.
© Quintessenz Verlag; PMID: 17568842 [PubMed - indexed for MEDLINE]
Removal of fixed partial dentures without destruction, our experience with the KaVo CORONAflex crown removing instrument
Bertold M, Endre S, Pál F
Semmelweis Egyetem, Fogorvostudományi Kar, Fogpótlástani Klinika, Budapest
Fogorv Sz. 2006 Dec;99(6):237-41, 01.12.2006
Removal of fixed, cemented restorations is a great challenge for dental practitioner in the everyday activity.
© PMID: 17444129 [PubMed - indexed for MEDLINE]
Removal of fixed partial dentures without destruction, our experience with the KaVo CORONAflex crown removing instrument
Bertold M, Endre S, Pál F
Semmelweis Egyetem, Fogorvostudományi Kar, Fogpótlástani Klinika, Budapest
Fogorv Sz. 2006 Dec;99(6):237-41, 01.12.2006
Removal of fixed, cemented restorations is a great challenge for dental practitioner in the everyday activity. After all, prosthodontic textbooks cover only briefly the destructive methods of fixed restoration's removal and does not deal with other techniques. In many cases--i.e. at fracture of porcelain that can not be repaired in the mouth, or loosening of one anchor in a multi-unit bridgework--it would be necessary to remove the bridge without destruction. Only few literature data is available on this topic. From 1998 we have made an attempt with the KaVo CORONAflex instrument to remove various types of fixed restorations without destruction. The indication of removal, the material of the bridge, location of abutment teeth in the dental arch and success of the removal were documented in each cases. From the 81 fixed prostheses 61 were successfully removed without any destruction. Sixty two of the restorations were porcelain fused to metal; 19 of them were cast restorations with acrylic resin facing (single crowns or bridges). In most of the cases the removal of the fixed prostheses was successful without any damage, and consequently remaking of the restorations was not necessary. In this way the additional stresses associated with the patients' dental treatment could be avoided and also time and dental as well as laboratory fees could be spared.
© PMID: 17444129 [PubMed - indexed for MEDLINE]
Removal of fixed partial dentures without destruction, our experience with the KaVo CORONAflex crown removing instrument
Bertold M, Endre S, Pál F
Semmelweis Egyetem, Fogorvostudományi Kar, Fogpótlástani Klinika, Budapest.
Fogorv Sz. 2006 Dec;99(6):237-41., 01.12.2006
Removal of fixed, cemented restorations is a great challenge for dental practitioner in the everyday activity. After all, prosthodontic textbooks cover only briefly the destructive methods of fixed restoration's removal and does not deal with other techniques. In many cases--i.e. at fracture of porcelain that can not be repaired in the mouth, or loosening of one anchor in a multi-unit bridgework--it would be necessary to remove the bridge without destruction.
© PMID: 17444129 [PubMed - indexed for MEDLINE]
Removal of fixed partial dentures without destruction, our experience with the KaVo CORONAflex crown removing instrument
Bertold M, Endre S, Pál F
Semmelweis Egyetem, Fogorvostudományi Kar, Fogpótlástani Klinika, Budapest.
Fogorv Sz. 2006 Dec;99(6):237-41., 01.12.2006
Removal of fixed, cemented restorations is a great challenge for dental practitioner in the everyday activity. After all, prosthodontic textbooks cover only briefly the destructive methods of fixed restoration's removal and does not deal with other techniques. In many cases--i.e. at fracture of porcelain that can not be repaired in the mouth, or loosening of one anchor in a multi-unit bridgework--it would be necessary to remove the bridge without destruction. Only few literature data is available on this topic. From 1998 we have made an attempt with the KaVo CORONAflex instrument to remove various types of fixed restorations without destruction. The indication of removal, the material of the bridge, location of abutment teeth in the dental arch and success of the removal were documented in each cases. From the 81 fixed prostheses 61 were successfully removed without any destruction. Sixty two of the restorations were porcelain fused to metal; 19 of them were cast restorations with acrylic resin facing (single crowns or bridges). In most of the cases the removal of the fixed prostheses was successful without any damage, and consequently remaking of the restorations was not necessary. In this way the additional stresses associated with the patients' dental treatment could be avoided and also time and dental as well as laboratory fees could be spared.
© PMID: 17444129 [PubMed - indexed for MEDLINE]
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 Contact:
Clinical Affairs
Dr. Emanuel von Kienlin
KaVo Dental GmbH
Bismarckring 39
88400 Biberach/Riss
Germany
Tel.: +49 7351 56 -3615
Fax: +49 7351 56 -71414
clinicalaffairs@kavo.com
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